I am experiencing an odd behavior in KDE in testing. It has been this
way for me since the KDE 6 transition, but initially thought it was
probably just some incompatibility with the transition. However, now
that we are getting ready for the packages that will ship with trixie,
I figured I would bring it up to see if anyone else is experiencing
it.

The symptoms are that my maximized windows shrink slightly over time,
ending up being a few pixals smaller than full-screen on the right and
bottom. It appears to happen when when switching between virtual
desktops, but not consistently (meaning not every time I switch
virtual desktops). It happens frequently enough that I need to redo
the maximization of at least one window about every hour. When doing
so, the window thinks it is still maximized, but if I click the button
to restore (unmaximize) the window and then click the button to
remaximize it, the window returns to the correct, fully-maximized
size.

A few specifics about my setup that might be applicable.

1. I am using X11.
2. I am using a 4K monitor with 175% scaling.
3. I have a panel on both the bottom and the right of the screen.
These are the two edges maximized windows march away from over time.

--
Soren Stoutner
soren@debian.org
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--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

On Monday, March 17, 2025 10:33:30 PM Mountain Standard Time Soren
Stoutner wrote:

I am experiencing an odd behavior in KDE in testing. It has been
this way for me since the KDE 6 transition, but initially thought
it was probably just some incompatibility with the transition.
However, now that we are getting ready for the packages that will
ship with trixie, I figured I would bring it up to see if anyone
else is experiencing it.

The symptoms are that my maximized windows shrink slightly over
time, ending up being a few pixals smaller than full-screen on the
right and bottom. It appears to happen when when switching between
virtual desktops, but not consistently (meaning not every time I
switch virtual desktops).

I just noticed an interesting way to consistently replicate this bug.
With Dolphin maximized, each time I click the Split or Close (split)
button in the upper-right it marches a few pixels away from the panel
on the right of the screen. This doesn’t caus the bottom of the
window to move, but it is enough to test for the problem.

It happens frequently enough that I need
to redo the maximization of at least one window about every hour.
When doing so, the window thinks it is still maximized, but if I
click the button to restore (unmaximize) the window and then click
the button to remaximize it, the window returns to the correct, fully-maximized size.

A few specifics about my setup that might be applicable.

1. I am using X11.
2. I am using a 4K monitor with 175% scaling.
3. I have a panel on both the bottom and the right of the screen.
These are the two edges maximized windows march away from over time.

--
Soren Stoutner
soren@debian.org
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--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

Le mardi 18 mars 2025, 21:59:14 heure d’été d’Europe centrale Soren Stoutner a écrit :

On Monday, March 17, 2025 10:33:30 PM Mountain Standard Time Soren Stoutner wrote:

I am experiencing an odd behavior in KDE in testing. It has been
this way for me since the KDE 6 transition, but initially thought
it was probably just some incompatibility with the transition.
However, now that we are getting ready for the packages that will
ship with trixie, I figured I would bring it up to see if anyone
else is experiencing it.

The symptoms are that my maximized windows shrink slightly over
time, ending up being a few pixals smaller than full-screen on the
right and bottom. It appears to happen when when switching between
virtual desktops, but not consistently (meaning not every time I
switch virtual desktops).

I just noticed an interesting way to consistently replicate this bug.
With Dolphin maximized, each time I click the Split or Close (split)
button in the upper-right it marches a few pixels away from the panel
on the right of the screen. This doesn’t caus the bottom of the
window to move, but it is enough to test for the problem.

Can you still reproduce it on 6.3.5 ?
I can’t (but I didn’t try before so I don’t have a reference point).

I seem to remember I backported a commit to fix a rounding issue with fractional scaling in one of the 6.3.5 packages but I can’t remember which one nor find it in the obvious candidates (kwin, plasma-workspace, plasma-desktop).
And there were many other fixes in kwin and plasma-workspace anyway.


Thanks,
--
Aurélien

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

On Tuesday, June 17, 2025 3:32:08 PM Mountain Standard Time Aurélien COUDERC
wrote:

Le mardi 18 mars 2025, 21:59:14 heure d’été d’Europe centrale Soren Stoutner

a écrit :

On Monday, March 17, 2025 10:33:30 PM Mountain Standard Time Soren

Stoutner wrote:

I am experiencing an odd behavior in KDE in testing. It has been
this way for me since the KDE 6 transition, but initially thought
it was probably just some incompatibility with the transition.
However, now that we are getting ready for the packages that will
ship with trixie, I figured I would bring it up to see if anyone
else is experiencing it.

The symptoms are that my maximized windows shrink slightly over
time, ending up being a few pixals smaller than full-screen on the
right and bottom. It appears to happen when when switching between virtual desktops, but not consistently (meaning not every time I
switch virtual desktops).

I just noticed an interesting way to consistently replicate this bug.
With Dolphin maximized, each time I click the Split or Close (split)
button in the upper-right it marches a few pixels away from the panel
on the right of the screen. This doesn’t caus the bottom of the
window to move, but it is enough to test for the problem.

Can you still reproduce it on 6.3.5 ?
I can’t (but I didn’t try before so I don’t have a reference point).

I seem to remember I backported a commit to fix a rounding issue with fractional scaling in one of the 6.3.5 packages but I can’t remember which one nor find it in the obvious candidates (kwin, plasma-workspace, plasma-desktop). And there were many other fixes in kwin and plasma-

workspace

anyway.

I just did some testing and I can still replicate the problem, but only under the following conditions. All testing was done using the packages currently in testing as of 17 June 2025 and a monitor running at 3840x2160.

1. Use X11 (the problem does not manifest in Wayland).
2. Set scaling to 175% (the problem does not manifest with scaling set to 200%).

When the above are true, clicking repeatedly on the Split/Close button in a maximized Dolphin window will cause the window to slowly march away from the right of the screen a few pixels at at time. Doing so about 15 times causes the gap to become easily visible. Other things that I haven’t fully tracked down cause other program to march away from both the right and bottom of the screen.

I had previously posited the problem might be related to running two panels, one on the bottom and one on the right, but testing indicates the panel configuration has no effect.

Given the specificity of the requirements to cause this bug to manifest, if it isn’t readily apparent what the problem is I might be inclined to just let it
go. X11 will be dead in just a few short decades (I know, I jest) and we can add a release note informing people that odd zoom scaling values might not be in their best interests.

--
Soren Stoutner
soren@debian.org
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--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

Hi.

Soren Stoutner - 18.06.25, 01:38:25 CEST:

Can you still reproduce it on 6.3.5 ?

I can’t (but I didn’t try before so I don’t have a reference point).

I seem to remember I backported a commit to fix a rounding issue with fractional scaling in one of the 6.3.5 packages but I can’t remember which one nor find it in the obvious candidates (kwin,
plasma-workspace, plasma-desktop). And there were many other fixes in
kwin and plasma-workspace anyway.

I just did some testing and I can still replicate the problem, but only
under the following conditions. All testing was done using the
packages currently in testing as of 17 June 2025 and a monitor running
at 3840x2160.

1. Use X11 (the problem does not manifest in Wayland).
2. Set scaling to 175% (the problem does not manifest with scaling set
to 200%).

Excellent find.

I can reproduce this on X11 with 150% scale on Full HD resolution.

Best,
--
Martin

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)